Kinetic Modelling of the Influence of H<sub>2</sub>S on Dibenzothiophene Hydrodesulfurization in a Batch System over Nano-MoS<sub>2</sub>
- 1 Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Egypt
- 2 Physical Chemistry Department, National Research Center, Cairo, Egypt
- 3 Department of Material Process Engineering, Graduate School of Engineering, Kyushu University, Fukuoka, Japan
Abstract
In this work, the possibility of enhanced activity during the hydrodesulfurization of dibenzothiophene over certain nano-MoS 2 catalyst due to the presence of H 2 S was examined by focusing on the reaction kinetics. With H 2 S generated in situ , the overall reaction followed the autocatalytic rate law; while in the absence of H 2 S the kinetics indicated a pseudo-first-order reaction. H 2 S appears to modify the relative contributions of parallel hydrogenation and desulfurization reactions by drastically increasing the hydrogenation rate. Kinetic models were developed that describe the hydrodesulfurization reaction at various H 2 S concentrations, and the kinetic parameters and adsorption equilibrium constants associated with this process were estimated by fitting the experimental data. The results suggest that the promotion and/or inhibition of hydrodesulfurization by H 2 S likely result from the same overall reaction mechanism.
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